Barrelhead for tumbling mills



Nov. 16, 1943. J. LAPSHANSKY BARREL HEAD FOR TUMBLING MILLS Filed March 20, 1943 Patented Nov. 16, 1943 There is a type of tumbling mill, for smoothing rough castings by subjecting them to blasts of abrasive material, in which an endless conveyor, spanning the space between parallel barrel heads or ends, supports and tumbles the castings; the

barrel heads preventing the castings from drop-' ping off at the sides of the conveyor. Such a mill is illustrated in the Peik Patent No. 1,882,443, dated October 11, 1943. I have operated and am now operating such a mill-and have found that the barrel heads are subjected to such severe punishment by the abrasive material that th life thereof is extremely short. The expedient has been adopted, as shown in said patent, of providing the barrel heads with detachable wearing plates which can be replaced at short intervals. This practice is, however, very wasteful because a heavy metal disk four feet or more in diameter must be discarded whenever a worn spot appears, because it is not practicable to patch it.

The object of my invention is to make it possible greatly to reduce the waste of time, effort and material occurring in the operation of such tumbling machines as heretofore constructed.

I have found, over a long period of'study, that the wear on the barrel heads follows a definite pattern, being always greatest in the central area and diminishing progressively toward the periphery. My invention consists, therefore, in providing metal in different zones in proportion to the average pattern of wear. By this meansthe full value of each barrel head or wearing plate therefor can be secured before discarding the same.

The various features of novelty whereby my invention is characterized will hereinafter bev pointed out with particularity in the claims; but, for a full understanding of my inventionand of its objects and advantages, reference may be had to the following detailed description taken in wherein:

Figure 1 is a face view of a barrel head embodying the present invention; Fig. 2 is a central axial section through the head and a fragment of the casing wall that supports the same; and Fig. 3 is a section on the same plane as Fig. 2, illustrating a second form.

In the drawing, I represents one of the end walls of a stationary casing such as is disclosed in the aforesaid Patent No. 1,882,443. This Wall is provided on the inner side with. a long, sleevelike hub 2 in which is journalled a stub shaft 3 fixed to and coaxial with a circular barrel head. In the arrangement shown in Fig. 2 the barrel 20 eter.

head comprises a body member 4 integral with the shaft, together with a wearing plate 5 secured to the body member by bolts 6. The wear ing plate is shown as being flaton one side that bears against the body member, whereas the other side I, which takes the wear, is convex. Thus the greatest thickness of the wearing plate is around the center, the thickness decreasing from there gradually toward the periphery where there may be a fiat, marginal band8 through which the bolts pass. It will be seen that the variations in thickness occur without abrupt change that would result in shoulders in the wearing face which, therefore, although curved, is smooth.

Although the wear is not distributed exactly in accordance with variations in thickness created thereby, the convex surface may advantageously be a section of a sphere of large diam- When the wearing plate is new it weighs somewhat more than a flat plate whose thickness is half as great; but, before it must be replaced, it weighs less than the ordinary flat plate that has outlived its usefulness, because a ,much

greater area must be worn thin before dangerous Consequently the weakness occurs anywhere. life of my improved wearing plate is at least several times greater than that of the ordinary fiat plate; thereby reducing the time during which a mill is out of use for repairs or replacements,

saving time in making repairs or replacements,

getting a maximum amount of service per pound of metal that much be discarded, and greatly reducing the number of wearing plates that must be manufactured in order to keep a mill running I for, say, a year. Heretofore wearing plates have sometimes been patched. Unless a careful, costly job of patching is done the patch does not last long. Because of the durability of my Wearing incentive to attempt patching remains.

' In Fig. 3 there is illustrated a form of head in which the wearing plate 9 has a double convexity, the body member Ill being dished, as

40 plates and the full service which they give, no connection with the accompanying drawing,

indicated at H, to provide a seat into which one bulging side of the plate fits. Such a construction, by increasing the thickness of the plate at the middle, over that in the first form,.

provides still longer life.

5 While I have illustrated and described with particularity only a single preferred form of my invention (with a slight modification) I do not desire to be limited to the exact structural details thus illustrated and described; but intend to cover all forms and arrangements which come tral area toward the periphery.

2; A rotatable circular barrel head for a tumbling andblasting mill ,having a concave side, and a solid wearing disk convex on; both faces fitted in the concavity of and fixed to th barrel end.'

3. A circular rotatable head for a tumbling and blasting mill comprising a body member and a wearing disk secured to one side thereof; the disk being thickened to produce an outward bulge which is greatest at thecenter and the surface of which [merges smoothly into a narrow flat marginal area, the thickened part of the disk being imperforate, andmeans passing through the flat marginal area to secure the disk to the body member p l, JOHN PSH 

